The desktop battery tester, GBM-3000 series uses AC 1kHz as the test signal. Measures battery's voltage and internal resistance to 300V (GBM-3300) and 80V (GBM-3080). The series features 3.5" TFT LCD, 4-wire measurement method, high-resolution (6-digit voltage / 5-digit resistance) measurement display capability, and independent GO/NOGO determination of voltage and resistance, various communications interfaces, etc. to meet various types of battery measurements. Ranging from single cell, battery cell, to the end product (battery), to facilitate users in achieving accurate measurements at all stages of production.